Konami will offer a digital copy Metal Gear Solid: Peace Walker to PlayStation 3 pre-orders of Metal Gear Solid: Ground Zeroes.

Peace Walker was originally produced for the PSP and marked the arrival of a key element for the series in the form of Mother Base: a central hub wherein the user could store weaponry and POWs.

The Mother Base idea is revisited and further explored in both Ground Zeroes and Phantom Pain, says Konami.